diagenetic control of nitrogen isotope ratios in holocene sapropels and recent sediments from the eastern mediterranean sea

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ID: 223039
2010
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Abstract
The enhanced accumulation of organic matter in Eastern Mediterranean sapropels and their unusually low &delta;<sup>15</sup>N values have been attributed to either enhanced nutrient availability which led to elevated primary production and carbon sequestration or to enhanced organic matter preservation under anoxic conditions. In order to evaluate these two hypothesis we have determined Ba/Al ratios, amino acid composition, N and organic C concentrations and &delta;<sup>15</sup>N in sinking particles, surface sediments, eight spatially distributed core records of the youngest sapropel S1 (10–6 ka) and older sapropels (S5, S6) from two locations. These data suggest that (i) temporal and spatial variations in &delta;<sup>15</sup>N of sedimentary N are driven by different degrees of diagenesis at different sites rather than by changes in N-sources or primary productivity and (ii) present day TOC export production would suffice to create a sapropel like S1 under conditions of deep-water anoxia. This implies that both enhanced TOC accumulation and &delta;<sup>15</sup>N depletion in sapropels were due to the absence of oxygen in deep waters. Thus preservation plays a major role for the accumulation of organic-rich sediments casting doubt on the need of enhanced primary production for sapropel formation.
Reference Key
mbius2010biogeosciencesdiagenetic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;J. Möbius;N. Lahajnar;K.-C. Emeis
Journal tetrahedron letters
Year 2010
DOI
10.5194/bg-7-3901-2010
URL
http://www.biogeosciences.net/7/3901/2010/bg-7-3901-2010.pdf
Keywords
ecologylifegeology

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